"During the trials that were held after the war, the tons of Zyklon-B ordered by the camps were attributed to homicidal use without any verification. By far the greater part (over 95 percent) was destined for delousing (effects and buildings) while only a very small part (less than 5 percent) had been used for homicidal gassings."
Winston Smith Ministry of Truth Archive
[Note: As this is taken from an archived site, missing pic below has been replaced by this site.]